Host Interface; Table D-2. Current Values - MSA Ultima X Series Installation & Maintenance Instructions Manual

Host Interface

Analog Output
The three-wire 4-20 mA current loop is connected on terminals marked
8-30 VDC(1), 4-20 mA OUT(2), and GND (3-wire)(3). The two-wire 4-20
mA current loop is connected on the 8-30 VDC(1) and 4-20 mA OUT(2)
terminals. Refer to the installation outline drawings shown in Chapter 1,
TABLE 1-1 for details.
This is the main output from this transmitter, representing the process
gas measurement, linearized and scaled according to the configured
instrument range. This output corresponds to the Primary Variable (PV).
HART communications are supported on this loop. This device has a
Capacitance Number (CN) of 1.
An inoperative device can be indicated by down-scale or up-scale
current, depending on the sensor type. Current values are shown in
TABLE D-2.

Table D-2. Current Values

DIRECTION
Linear over-range Down
Up
Device malfunction
indication Down: less than
Up: greater than
Maximum current
Multi-drop Current draw
Lift-off voltage,
3-wire PCBA
Lift-off voltage,
2-wire PCBA
D-2
VALUES VALUES
(% OF RANGE) (MA OR V)
0% 4.00 mA
+105.0% +1.0% 20.64 to 20.96 mA
3.5 mA
20.96 mA
22.0 mA
3.5 mA
8 VDC
13 VDC @ 250 Ohms